public void InsertUserInfo(UserInfo userInfo)
        {
            var db = new VegetableDBEntities();

            db.UserInfo.Add(userInfo);
            //https://stackoverflow.com/questions/21606454/how-to-handle-system-data-entity-validation-dbentityvalidationexception
            db.SaveChanges();
        }
        public UserInfo GetUserInfo(string guid)
        {
            var db       = new VegetableDBEntities();
            var userInfo = (from x in db.UserInfo
                            where x.Guid == guid
                            select x).FirstOrDefault();

            return(userInfo);
        }